Elevator apparatus.



No. 69I,276. Patentesd lain. I4. |902.

C l KTTJEN.- ELE'vATYon APPARATUS.

, (Applicgtion led Nov. 4z 1899.) (No Model.) *Y 1 2 Sheets-Sheet l.

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" no. 691,276. Patented 1an. I4, |902.

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ELEVATUR'APPABATUS.

(Application lsd Nov. 4, 1.899,) (no nodal.) 2 sheets-snm 2.

ma@ A UNITED STATES PATENT OFFICE.

CARL KTTGEN, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO SIEMENS dt HALSKEELECTRIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

ELEVATOR APPARATUS.

SPECIFICATION forming* part of Letters Patent No. 691,276, dated January14, 1902. Application tiled November 4, 1899. Serial No. 735,810. (Nomodel.)

To all whom, it may concern:

Be it known that I, CARL KTTGEN, a subject of the Emperor of Germany,residing at Charlottenburg, Germany, have invented a certain new anduseful Improvement in Elevator Apparatus, (Case No. 244,) of which thefollowing is a full, clear, concise, and exact description, referencebeing had to the accompanying drawings, forming a part of this specilofication.

My invention relates to elevator apparatus, and more particularly tothat class of elevator apparatus known as hoisting apparatus, althoughIdo not wish to be limited to x5 the precise apparatus in which theinvention may be employed.

My invention relates particularly to that class of elevator apparatus inwhich sheaves are employed for transferring power from zov motors to theelevators, this arrangement being preferable to drums, which have to beof inordinate sizes when the extent of travel of the eievators is great,it having frequently been necessary to wind two or more layers z5 ofrope around the drums in order to have drums of a sufficiently-reduceddiameter to be practicable. This arrangement is very objectionable, asthe wear upon the rope is great, the life of the rope being consider- 3oably shortened thereby. vThe employment of sheaves is an improvement inthis respect in that the rope does not have to be rapidly wound aboutthe same; but there are many serious objections to the practical use of3 5 sheaves, among which may be mentioned the fact that it is verydifficult to secure sheaves of exactly the same diameter, so that wherea plurality of sheaves are employed to secure the necessary frictionundue strains are ex- 4o erted upon the rope, which are difficult tocounteract and provide for. This harmful eect is due to the fact thatthe plurality of sheaves for operating a single rope are driven by asingle prime mover, the prime mover obviously being incapable ofrotating the sheaves at different rates of speed.

I will point out my invention in the claims. In practicing the same Iemploy a plurality of driving-sheaves about which a single rope 5o ispassed, the sheaves having frictional en gagement with the rope to drivethe same, and a prime mover associated with each sheave, which primemover may be adjusted to accommodate its speed to the diameter of theparticular sheave driven thereby, so that even though the sheaves be ofslightly-different diameter the rope Wound about the same will not besubject to the strains heretofore exerted thereon.

I will explain my invention more particularly by reference to theaccompanying drawings, in which- Figure l is a diagrammatic viewrepresenting apparatus of the prior art in elevation. Fig. 2 is a planview of parts shown in Fig. l. Fig. 3 is a diagrammatic view showingapparatus in elevation equipped in accordance with my invention. Fig. 4is a plan View of the apparatus shown in Fig. 3. Fig. 5 is a perspectiveview of a modified form of my inventon. Fig. 6 is a perspective view ofstill another form of myinvention. Figs. 7 and 8 are plan views of the'apparatus shown in Figs. 5 and 6.

Like parts are indicated by similar letters of reference throughout thedierentgures.

In Figs. 1 and 2 I have illustrated the apparatus of the prior artcomprising a single prime mover a, a plurality of driving-sheaves b b,driven by the same prime mover a, and an operating-rope c, passed aboutthe sheaves b b, as shown, to secure the desired friction, and carryingupon its ends the elevator cars or buckets d d, the end portion of therope c being passed over idler-sheaves c e. If the sheaves b b should beof the same diameter, the apparatus may work satisfactorily for a time.If, however, the grooves in the sheaves should wear unevenly, the ropewill be Wound about one sheave faster than about another sufcientl y tocause injurious strains to be exerted upon the rope. The precisemechanism shown in Figs. 1 and2 for driving the sheaves b b by the sameprime mover consists in a link f, connected with the pitman of the primemover (in this case a steamengine) and uniting the cranks secured to theshafts of the sheaves.

In Figs. 3 and 4t I have shown independent roo prime movers g g, (inthis instance in the form of steam-engines,) the pitman of each primemover being connected with a crank of the corresponding sheave. Theoperatingrope c is likewise passed over idler-sheaves e e and carries atits ends the elevator-cars d d. The relative diameters of the sheaves bb, which are connected by the cable or rope in tandem with theconstruction shown in Figs. 3 and 4, is not so important as with theconstruction of the prior art, (shown in Figs. 1 and 2,) as each primemover may be adj usted to the rate of speed necessary to secure thedesired Erictional engagement and application of the power to thevoperatingrope. While I have shown steam-engines in the apparatusillustrated in Figs. 3 and 4, I may employ other forms of primemoversfor example, such as are indicated in Figs. 5, 6, '7, and 8.

In Figs. 5 and 7 I have shown a construction wherein the prime movers gg may be 'in the form of inductionmotors directly -coupled with thesheaves b b, about which the operating-rope c may be passed. In theapparatus shown in Figs. 5 and 7 an idler-sheave e may be employed,about which the rope may be passed, the rope also lpreferably carryingat its ends the elevator cars or buckets d d.

Power, however, may be applied to the sheave e, as in the apparatusillustrated in Figs. 6 and-8. In the arrangementillustrated in Figs.Gand 8 the frictional engagement between the rope c and the sheave e isapproximately twice that between the said 4rope and either of thesheaves b b. This being the case, rotary 'eort may be applied throughthe agency of a prime mover or prime movers h having the necessarycapacity to rotate the sheave with the requisite power. The sheaves eare preferably diagonally disposed with relation to the sheavesbb in theapparatus shown in Figs.

5, 6, 7, and S in order that the ropes may be properly directed in theirtravel from one sheave to another.

`While I have diagrammatically illustrated an apparatus constructed inaccordance with myinvention, Vthe mechanical details of constructionwill be readily apparent to those skilled in the art. I do not wish tobe limited tothe precise features of construction shown; but

Having thus described my invention, I

claim as new and desire to secure by Letters Patent- 1. In an elevatorapparatus, the combination with a continuous operating-rope, of anelevator-car having fixed engagement with the rope, a plurality ofsheaves for driving the rope and connected thereby in tandem, and primemovers, one for operating each driving-sheave, substantially asdescribed.

2. In an elevator apparatus, the combination with a continuousoperating-rope, of an elevator-car having iixed engagement with therope, two sheaves for driving the rope and connected thereby in tandem,prime movers, one for operating each driving-sheave, and a third sheavee, about which said rope is also passed, substantially as described.

3. In an elevator apparatus, the combination with a continuousoperating-rope, of an elevator-car having fixed engagement with therope, two sheaves for driving the rope and connected thereby in tandem,prime movers, one for operating each driving-sheave, and a third sheavee, about which said rope is also passed, the said sheave e beingdiagonally disposed with relation to the aforesaid sheaves,substantially as described.

4. In an elevator apparatus, the combination with an operating-rope, ofan elevatorcar having xed engagement with the rope, two sheaves fordriving the rope and connected thereby in tandem, prime movers, one foroperating each driving-sheave, the prime movers exerting driving forceupon the rope in the same direction, a third sheave e, about which saidrope is also passed, and a third prime mover for rotating the sheave e,substantially as described.

5. In an elevator apparatus,` the combination with two sheaves, of arope passing about the same to secure the necessary friction, a primemover for driving each sheave, a third sheave e about which the saidrope is also passed, the said sheave c being diagonally disposed withrelation to the sheaves b b, and a third .prime mover for rotating thesheave e, substantially as described.

In witness-whereof I hereunto subscribe my name this 14th day offOctober, D. 1899.

.CARL KO'ITGEN.

Witnesses: Y WOLDEMAR HAUPT, HENRY HAsPER.

